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I have been testing my stacked 320's in a loop with my overvolted 920 and 4870 with a 355+restop. Fans are S-flex E's (1200 rpm). It produced a 2 degree improvement. Adding 3 more fans another 2 degree improvement for a 4 degree total. By the way, this matches the performance of adding a MCR 220 to the loop instead of the stack.

I am about 50 minutes from wrapping up the parallel tests, I will try to fit series config testing in during a CPU block testing break.

Looking forward to the results

Reviewing swiftech's chart here:

The difference between 1gpm and 2GPM is about 50 watts with 2100RPM Delta Fans. So about 50/400 or a 12% gain for a full double the flow rate.

You won't quite be doubling the flow rate because your system pressure drop increase, so it's probably more like a 10% gain if that. Soo...I'd guess maybe .5C to 1C depending on what the water/air difference is.

The difference between 1gpm and 2GPM is about 50 watts with 2100RPM Delta Fans. So about 50/400 or a 12% gain for a full double the flow rate.

You won't quite be doubling the flow rate because your system pressure drop increase, so it's probably more like a 10% gain if that. Soo...I'd guess maybe .5C to 1C depending on what the water/air difference is.

Plus, if we're dealing with the fractions of degrees here, then having the coldest air cool the water last might just be worth worth a little bit as well I bet

I have been testing my stacked 320's in a loop with my overvolted 920 and 4870 with a 355+restop. Fans are S-flex E's (1200 rpm). It produced a 2 degree improvement. Adding 3 more fans another 2 degree improvement for a 4 degree total. By the way, this matches the performance of adding a MCR 220 to the loop instead of the stack.

The difference between 1gpm and 2GPM is about 50 watts with 2100RPM Delta Fans. So about 50/400 or a 12% gain for a full double the flow rate.

You won't quite be doubling the flow rate because your system pressure drop increase, so it's probably more like a 10% gain if that. Soo...I'd guess maybe .5C to 1C depending on what the water/air difference is.

So plumbing the second MCR420 in series is only going to net about a 10% improvement?